add *-softfp-* support to the vendor field for people who want this for binary compat with closed sourced drivers #416727 by Raúl Porcel; merge the tc-is-hardfloat helper into the one place where it is called in the whole tree to avoid further confusion between when the return values of tc-is-softfloat and tc-is-hardfloat

[Fortran] Do a little reworking, since these functions remain unused by anything. Rename tc-getF90() to tc-getFC() for consistency with autotools, fortran.eclass, etc. Drop tc-getFORTRAN() -- people should use the appropriate function.

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